Regal rexnord Thomas xtsr series Manual

F O R M

Thomas®XTSR71 Installation and

Maintenance Manual • Sizes 494-5258

CP3-001E

Revised

June 2023

Industrial Powertrain Solutions

Regal Rexnord

Application Engineering: 800 626 2093

PTSAppEng@regalrexnord.com

rexnord.com/couplings

Indicates a hazard which, if not avoided, will result in

serious injury or death.

Indicates a hazard which, if not avoided, could result

in minor or moderate personal injury.

Indicates a hazard which, if not avoided, could result

in serious injury or death.

Indicates information considered important, but not hazard-

related (e.g. messages relating to property damage).

• The coupling should be stored in a dry corrosion protected

environment, free from external loads (for example by stacking) to

prevent damage which may cause a hazard when the coupling is put

into service.

• For ATEX requirements the guard must have a minimum of 12.7 mm

(1/2 in) radial clearance to the coupling outside diameter and allow for

proper ventilation.

• All conductive parts of the equipment should be connected in such

a way that hazardous electrical potential differences cannot occur. In

case insulated metal parts could be charged thus becoming a potential

ignition source, earth connections must be provided.

• All work on the coupling must be performed when the coupling is at

rest with no load.

• Do not start or jog the motor, engine, or drive system without securing

the coupling components. If the equipment is started with only a hub

attached, the hub must be properly mounted and ready for operation,

with the key and set screw (if included) fastened. When the full

coupling assembly is started, all fasteners and hardware must be

completely and properly secured. Do not run the coupling with loose

fasteners.

• Use explosive environment appropriate tools only, for more information

see DIN EN 1127-1:2008:02, Annex A.

• The coupling may only be used in accordance with the technical data

provided in the Thomas disc coupling catalog. Customer modiﬁcations

and alterations to the coupling are not permissible.

• Safety should be a primary concern in all aspects of coupling

installation, operation, and maintenance.

• Proper lockout/tagout procedures must be followed to safeguard

against unintentional starting of the equipment.

• Make sure to disengage the electrical power and any other sources

of potential energy before you perform work on the coupling.

• Do not make contact with the coupling when it is rotating and/or in

operation.

• Because of the possible danger to person(s) or property from

accidents which may result from improper use or installation of these

products, it is extremely important to follow the proper selection,

installation, maintenance and operational procedures.

• Installation should be carried out by skilled personnel only.

All personnel involved in the installation, service, operation,

maintenance, and repair of this coupling and the connected

equipment must read, understand, and comply with these

Installation and Maintenance instructions. The Installation and

Maintenance instructions and assembly drawing, if provided, must

be at hand at the installation site.

• Packaging material can generate electrostatic charges. It may then

become an explosive hazard. It must be removed from the coupling

outside any hazardous areas.

• All rotating power transmission products are potentially dangerous

and can cause serious injury. They must be properly guarded in

compliance with OSHA, ANSI, ATEX, European machine safety

standards and other local standards. It is the responsibility of the

user to provide proper guarding.

• For this coupling to meet the ATEX requirements, you must precisely

follow these installation and maintenance instructions, and the

supplement form 0005-08-49-01. This supplement outlines the ATEX

requirements. If the operator does not follow these instructions, the

coupling will immediately be considered non-conforming to ATEX.

GENERAL SAFETY INSTRUCTIONS

• All spare parts for service or replacement must originate from or be

approved by Rexnord.

Type XTSR71

Sizes 494-5258

Figure 1 – Thomas XTSR71 Coupling

1. General Information

1.1 Rexnord®Thomas®Couplings are designed to provide a

mechanical connection between the rotating shafts of

mechanical equipment, using ﬂexible discs to accommodate

inherent misalignment while transmitting the power and

torque between the connected shafts.

1.2 These instructions are intended to help you to install and

maintain your Rexnord Thomas coupling. Please read these

instructions prior to installing the coupling, and prior to

maintenance of the coupling and connected equipment.

Keep these instructions near the coupling installation and

available for review by maintenance personnel. For special

engineered couplings, Rexnord may provide an engineering

drawing containing installation instructions that take

precedence over this document.

1.3 Rexnord owns the copyright of this material. These

Installation and Maintenance instructions may not be

reproduced in whole or in part for competitive purposes.

PRECAUTION

For this coupling to meet the ATEX requirements, you must

precisely follow these installation and maintenance instructions,

and the supplement form 0005-08-49-01. This supplement

outlines the ATEX requirements. If the operator does not follow

these instructions, the coupling will immediately be considered

non-conforming to ATEX.

Figure 3 – Disc Pack Hardware Kit

Consisting of parts 1, 3and 4above.

Thomas XTSR71 couplings are delivered from the factory with a

fully assembled center member consisting of a center spool, two

adapters, disc packs, bolts, bushings and locknuts that have

already been tightened at the factory to the torque speciﬁed in

Table 5. The center member assembly is ready for ﬁeld installation

and it is recommended that you do not disassemble it unless you

are replacing the disc packs. Cap screws will need to be installed

and tightened during installation.

Figure 2 – Thomas®XTSR71 Coupling Components

Note:Coupling component numbers above correspond to the component numbers in the column headers of Table 1.

317

Cap Screws

XTSR71

Coupling

Size

Standard

Hub + Cap

Screw Kit

Part No.**

XL Hub +

Cap Screw

Kit Part No.

Standard

Adapter

Part No.

(2 per

coupling)

Adapter

XXL

Adapter

Center Spool (1 per Coupling) 2Disc Pack

2 per

Coupling

Part No.

Hardware Kit (Bolts, Locknuts, and Overload

Bushings) for One Disc Pack 12

Part No.

“C”

Length

(in)

Part No.

“C”

Length

(mm)

Hardware

Kit Part

No.*

Bolts

Quantity

Locknuts

Quantity

Bushings

Quantity

10003235 3.50 10003238 100

494 10611141 10611142 10003755 10003215 10003216 10003236 3.75 10003239 140 10003753 10611144 4 4 4

10003237 5.00 --- ---

10003240 3.50 10003243 100

644 10611142 --- 10003754 --- 10003218 10003241 3.75 10003244 140 10002803 10611145 4 4 4

10003242 5.00 --- ---

10001131 10001781 10002805

10000871 3.50 10000801 100

10000091 10001561 6 6 6726 10001611 10001612 10311913 3.75 10000860 140

10000872 4.38 --- ---

10000873 5.00 --- ---

10001132 10001782 10002806

10355817 3.50 10000802 100

10000092 10001562 6 6 6826 10001612 10001613 10319474 3.75 10000861 140

10000875 4.38 --- ---

10000876 5.00 --- ---

10001133 10001783 10002807

10613540 3.75 10000862 100

10000093 10001563 6 6 6

10000877 4.38 10000803 140

996 10001613 10001614 10000878 5.00 --- ---

10000879 7.00 10000863 180

1088 10001614 10001615 10001134 10001784 10002808 10000880 5.00 10000804 140 10000094 10001564 8 8 8

10000881 7.00 10000864 180

1298 10001615 10001616 10001135 10001785 10002809

10000882 5.00 10000805 140

10000095 10001565 8 8 810000883 7.00 10000865 180

--- --- --- 250

1548 10001616 10001617 10001136 10001786 10002810 10000885

--- 10000866 140

10000096 10001566 8 8 87.00 10000806 180

--- 10000867 250

1698 10001617 10001618 10001137 10001787 10002811 10000886 7.00 10000807 180 10000097 10001567 8 8 8

--- --- 10000868 250

1928 10001618 10001619 10001138 10001788 10002812

10000887 7.00 10000808 180

10000098 10001568 8 8 810000888 7.50 10000869 250

10000889 8.00 --- ---

2068 10001619 10001620 10001139 10001789 10002813 10000891 8.00 10000809 250 10000099 10001569 8 8 8

2278 10001620 10001621 10001140 10001790 10002814 10000892 8.00 10000810 250 10000100 10001570 8 8 8

2468 10001621 10001622 10001141 10001791 10002815 10000893 9.00 10000811 250 10000101 10001571 8 8 8

2698 10001622 10001623 10001142 10001792 10002816 --- --- 10000812 250 10000102 10001572 8 8 8

2888 10001623 10001624 10001143 10001793 10002817 --- --- --- --- 10000103 10001573 8 8 8

3058 10001624 10001631 10001144 10001794 10002818 --- --- --- --- 10000104 10001574 8 8 8

3358 10001631 10001625 10001145 10001795 10002819 --- --- --- --- 10000105 10001575 8 8 8

3668 10001625 10001626 10001146 10001796 10002820 --- --- --- --- 10000106 10001576 8 8 8

3908 10001626 10001627 10001147 10001797 10002821 --- --- --- --- 10000107 10001577 8 8 8

4178 10001627 10001628 10001148 10001798 10002822 --- --- --- --- 10000108 10001578 8 8 8

4588 10001628 10001629 10001149 10001799 10002823 --- --- --- --- 10000109 10001579 8 8 8

4918 10001629 10001630 10001150 10001800 --- --- --- --- --- 10000110 10001580 8 8 8

5258 10001630 --- 10001151 --- --- --- --- --- --- 10000111 10001581 8 8 8

*Disc pack hardware sold as kits only.

**All hub part numbers are non bored and include adapter hub hardware kit.

Table 1 — Rexnord®Thomas®XTSR71 Coupling Component Part Numbers

Note: the circled numbers identiﬁed in the column headers below, correspond to the coupling component numbers in Figures 2 and 3.

2. Hub Mounting

WARNING! Be sure to disengage the electrical power and any

other sources of potential energy before you perform work on the

hub and coupling assembly.

2.1 Examine the coupling assembly to assure there is no visible

damage.

2.2 Clean the hub bores and shafts using lint-free cloth. Remove

any nicks or burrs.

2.3 The key(s) should have a close side-to-side ﬁt in the keyway

in the hub and shaft, with a slight clearance over the top

when assembled

Figure 4 – Mounting Hubs on Shafts

2.4 Remove the cap screws that attach the hubs to the

adapters, and remove both hubs.

CAUTION! When heating hubs is required, an oven is

preferred and an open ﬂame is not recommended. If ﬂame

heating is considered mandatory, it is important to provide

uniform heating to avoid distortion and excessive

temperature. A thermal stick applied to the hub surface will

help determine the hub temperature.

CAUTION! Touching hot hubs causes burns. Wear safety

gloves to avoid contact with hot surfaces.

3. Straight Bore with Clearance/Slip Fit

3.1 Install the key(s) in the shaft.

3.2 Check to be sure that the set screw(s) in the hub does not

protrude into the keyway or the bore. Remove or back out

the set screw to provide clearance during assembly.

3.3 Slide the hub up the shaft to the desired axial position.

3.4 If used; assemble and tighten the set screw(s) using a

calibrated torque wrench to the values shown in Table 2.

Table 2 — Set ScrewTightening Torque

CAUTION! Never use two set screws with one on top of the other in the same tapped hole.

Set Screw Units – METRIC

Set Screw Size M3 M4 M5 M6 M8 M10 M12 M16 M20 M24

Hex Head Key Size 1.5 2 4 3 4 5 6 8 10 12

Tightening

Torque

(Nm) 0.8 2 3 6 12 25 50 100 206 379

(lb-in) 7 17 30 55 110 220 440 880 1,827 3,358

Set Screw Units – INCH

Set Screw Size #6-40 #8-32 NF #10-32 NF 1/4-28 NF 5/16-24 NF 3/8-24 NF 1/2-20 NF 5/8-11 NC 3/4-10 NC 7/8-9 NC 1.00-8 NC

Hex Head Key Size 1/16 5/64 3/32 1/8 5/32 3/16 1/4 5/16 3/8 1/2 9/16

Tightening

Torque

(Nm) 1 2 4 9 16 31 75 120 217 325 452

(lb-in) 9 17 31 76 144 276 660 1,060 1,920 2,880 4,000

4. Straight Bore with Interference Fit

4.1 Accurately measure the bore and shaft diameters to assure

proper ﬁt.

4.2 Install the key(s) in the shaft.

4.3 Heat the hub in an oven until the bore is sufﬁciently larger

than the shaft. 350°F (177°C) is usually sufﬁcient for

carbon steel hubs. Do not exceed 500°F (260°C).

4.4 With the hub expanded, install it quickly on the shaft to

the desired axial position. A pre-set axial stop device can

be helpful.

Figure 5 – Shaft end to hub

face measurement example

Figure 6 – Dial indicator placement for

axial draw measurement example

5. Taper Bore

5.1 Check for acceptable contact pattern between the hub and

the shaft.

5.2 Put the hub on the shaft, keeping the keyways (if existing)

aligned.

5.3 Lightly tap the face of the hub with a soft mallet. The

resultant position will provide a starting point for the hub

axial draw up.

5.4 Use a depth micrometer to measure the distance from the

shaft end to the hub face, as shown in Figure 5. Record the

dimension.

5.5 Mount a dial indicator to read axial hub advancement, as

shown in Figure 6. Alternatively, the indicator can be

positioned to contact the end of the hub. Set the indicator

to “zero.”

5.6 Remove the hub and install the key(s) in the shaft.

5.7 Heat the hub in an oven until the bore is sufﬁciently larger

than the shaft. 350°F (177°C) is usually sufﬁcient for carbon

steel hubs. Do not exceed 500°F (260°C).

5.8 Higher temperatures may be required for higher

interference ﬁt levels where alloy steel hubs may be

encountered. A general rule to consider is that for every

160°F increase in temperature, steel will expand 0.001 inch

for every inch of shaft diameter (or 0.029 mm/100°C). When

calculating temperatures, also consider additional expansion

to provide clearance and allow for a loss of heat and

subsequent shrinkage during the handling process.

5.9 With the hub expanded, install it quickly on the shaft to the

“zero” set point. Continue to advance the hub up the taper

to the desired axial position, as deﬁned by Regal Rexnord’s

customer. Use the indicator as a guide only. A pre-set axial

stop device can be helpful.

5.10 Inspect the assembly to verify that the hub is properly

positioned. Consult Regal Rexnord if necessary.

5.11 Install any hub axial retention device (if any) in accordance

with the equipment manufacturer’s speciﬁcations.

6. Shaft Alignment

NOTICE Soft foot – the equipment must rest ﬂat on its base. If

one or more feet of the machine are shorter, longer, or angled in

some way to prevent uniform contact (a condition commonly

known as “soft foot”) it must now be corrected.

NOTICE To improve the life of the coupling, the shafts must be

aligned to minimize distortion of the ﬂexing elements. Shaft

alignment is required in the axial, parallel, and angular directions,

with each of these values not to exceed the recommended

ratings for the coupling and the alignment values shown in Table 3.

Shaft alignment can be measured using various established

methods, including Laser Alignment, Reverse Dial Indicator, and

Rim and Face.

Move the connected equipment to achieve acceptable alignment.

When well aligned, the disc packs will be centered and

approximately parallel to their mating ﬂange faces and the ﬂexing

elements will have little visible waviness when viewed from the

side.

As a guide, the maximum and minimum values for dimension

“N” shown in Figure 7 are given in Table 3. These dimensions are

suggested for initial installation. Additional capacity is available to

compensate for thermal and structural equipment movement.

Maximum axial capacity values for these couplings are also given

in Table 3.

Table 3 shows installation limits for Angular and Parallel

alignment. The Angular Alignment Total Indicator Reading value is

the maximum difference between the measurements (X-Y) taken

between opposite sides of the center spool ﬂange and adapter

ﬂange as shown in Figure 8. The Parallel Alignment value “P” is

the offset between the centers of the hubs, as shown in Figure

9. If parallel offset is measured by rotating the hubs with a dial

indicator on the outside diameter, the total indicated reading

should be divided by (2) to calculate “P”.

Figure 7 – Disc Gap N

Figure 9 – Parallel Misalignment

Figure 8 – Angular Misalignment

Table 3 — Alignment Values

XTSR

Size

“A”

Dimension

“A”

Dimension

“N”

Dimension “C” Length

(distance

between hub

ﬂanges)

Installation

Axial Limits

+/-

Axial

Capacity

+/-

Recommended Installation Limits***

Parallel Misalignment Angular

Misalignment

Between Hubs

Installation

(X-Y)

Standard Hub

Angular

Misalignment

Between Hubs

Installation

(X-Y)

XL Hub

Parallel

Alignment Total

Indicator Read-

ing (TIR*)

Installation

Limit Parallel

Offset

“P”**

Std. Hub XL Hub Min. Max. Min. Max.

(in) (mm) (in) (mm) (in) (in) (mm) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm) (in) (mm)

494 2.77 70.0 3.36 85.0 0.33 0.35 8.3 8.8

3.50 88.9

0.012 0.30 0.045 1.2

0.035 0.89 0.018 0.44

0.004 0.10 0.004 0.10

3.75 95.3 0.038 0.95 0.019 0.48

5.00 127.0 0.050 1.27 0.025 0.64

3.94 100.0 0.039 1.00 0.020 0.50

5.51 140.0 0.055 1.40 0.028 0.70

644 3.36 85.0 --- --- 0.33 0.35 8.3 8.8

3.50 88.9

0.017 0.43 0.068 1.7

0.035 0.89 0.018 0.44

0.004 0.10 --- ---

3.75 95.3 0.038 0.95 0.019 0.48

5.00 127.0 0.050 1.27 0.025 0.64

3.94 100.0 0.039 1.00 0.020 0.50

5.51 140.0 0.055 1.40 0.028 0.70

726 3.74 95.0 4.25 108.0 0.33 0.35 8.3 8.8

3.50 88.9

0.026 0.65 0.051 1.3

0.028 0.71 0.014 0.36

0.005 0.13 0.006 0.15

3.75 95.3 0.030 0.76 0.015 0.38

4.38 111.1 0.035 0.89 0.018 0.44

5.00 127.0 0.040 1.02 0.020 0.51

3.94 100.0 0.031 0.80 0.016 0.40

5.51 140.0 0.044 1.12 0.022 0.56

826 4.25 108.0 5.08 129.0 0.36 0.38 9.1 9.6

3.50 88.9

0.030 0.75 0.059 1.5

0.028 0.71 0.014 0.36

0.006 0.15 0.007 0.18

3.75 95.3 0.030 0.76 0.015 0.38

4.38 111.1 0.035 0.89 0.018 0.44

5.00 127.0 0.040 1.02 0.020 0.51

3.94 100.0 0.031 0.80 0.016 0.40

5.51 140.0 0.044 1.12 0.022 0.56

996 5.08 129.0 5.51 140.0 0.37 0.39 9.3 9.9

3.75 95.3

0.035 0.90 0.070 1.8

0.030 0.76 0.015 0.38

0.007 0.18 0.008 0.20

4.38 111.3 0.035 0.89 0.018 0.45

5.00 127.0 0.040 1.02 0.020 0.51

7.00 177.8 0.056 1.42 0.028 0.71

3.94 100.0 0.031 0.80 0.016 0.40

5.51 140.0 0.044 1.12 0.022 0.56

7.09 180.0 0.057 1.44 0.028 0.72

1088 5.51 140.0 6.54 166.0 0.40 0.42 10.1 10.7

5.00 127.0

0.025 0.65 0.051 1.3

0.020 0.51 0.010 0.25

0.005 0.13 0.006 0.15

7.00 177.8 0.028 0.71 0.014 0.36

5.51 140.0 0.022 0.56 0.011 0.28

7.09 180.0 0.028 0.72 0.014 0.36

1298 6.54 166.0 7.83 199.0 0.50 0.52 12.6 13.3

5.00 127.0

0.031 0.80 0.061 1.6

0.020 0.51 0.010 0.25

0.006 0.15 0.008 0.20

7.00 177.8 0.028 0.71 0.014 0.36

5.51 140.0 0.022 0.56 0.011 0.28

7.09 180.0 0.028 0.72 0.014 0.36

9.84 250.0 0.039 1.00 0.020 0.50

1548 7.83 199.0 8.66 220.0 0.57 0.59 14.4 5.1

7.00 177.8

0.037 0.90 0.073 1.8

0.028 0.71 0.014 0.36

0.008 0.20 0.008 0.20

5.51 140.0 0.022 0.56 0.011 0.28

7.09 180.0 0.028 0.72 0.014 0.36

9.84 250.0 0.039 1.00 0.020 0.50

1698 8.66 220.0 9.66 245.4 0.61 0.64 15.4 16.2

7.00 177.8

0.040 1.00 0.080 2.0

0.028 0.71 0.014 0.36

0.008 0.20 0.009 0.237.09 180.0 0.028 0.72 0.014 0.36

9.84 250.0 0.039 1.00 0.020 0.50

1928 9.66 245.4 10.39 264.0 0.66 0.69 16.7 17.4

7.00 177.8

0.046 1.15 0.091 2.3

0.028 0.71 0.014 0.36

0.009 0.23 0.010 0.25

7.50 190.5 0.030 0.76 0.015 0.38

8.00 203.2 0.032 0.81 0.016 0.41

7.09 180.0 0.028 0.72 0.014 0.36

9.84 250.0 0.039 1.00 0.020 0.50

2068 10.39 264.0 11.44 290.5 0.71 0.74 18.0 18.8 8.00 203.2 0.049 1.25 0.097 2.5 0.032 0.81 0.016 0.41 0.010 0.25 0.011 0.28

9.84 250.0 0.039 1.00 0.020 0.50

2278 11.44 290.5 12.32 313.0 0.74 0.77 18.8 19.5 8.00 203.2 0.054 1.35 0.107 2.7 0.032 0.81 0.016 0.41 0.011 0.28 0.012 0.30

9.84 250.0 0.039 1.00 0.020 0.50

2468 12.32 313.0 13.58 345.0 0.79 0.82 20.1 20.8 9.00 228.6 0.058 1.50 0.116 3.0 0.036 0.91 0.018 0.46 0.012 0.30 0.013 0.33

9.84 250.0 0.039 1.00 0.020 0.50

2698 13.58 345.0 15.00 381.0 0.91 0.94 23.0 23.9 9.84 250.0 0.064 1.60 0.127 3.2 0.039 1.00 0.020 0.50 0.013 0.33 0.014 0.36

2888 15.00 381.0 15.94 405.0 0.97 1.00 24.7 25.4 12.00 304.8 0.068 1.75 0.136 3.5 0.048 1.22 0.024 0.61 0.014 0.36 0.015 0.38

3058 15.94 405.0 17.20 437.0 0.97 1.01 24.7 25.6 12.00 304.8 0.072 1.85 0.144 3.7 0.048 1.22 0.024 0.61 0.015 0.38 0.017 0.43

3358 17.20 437.0 18.98 482.0 1.06 1.09 27.0 27.7 12.00 304.8 0.079 2.00 0.158 4.0 0.048 1.22 0.024 0.61 0.017 0.43 0.018 0.46

3668 18.98 482.0 19.80 503.0 1.18 1.21 29.9 30.8 15.00 381.0 0.087 2.20 0.173 4.4 0.060 1.52 0.030 0.76 0.018 0.46 0.019 0.48

3908 19.80 503.0 20.83 529.0 1.18 1.21 29.9 30.8 15.00 381.0 0.093 2.35 0.185 4.7 0.060 1.52 0.030 0.76 0.019 0.48 0.020 0.51

4178 20.83 529.0 23.94 608.0 1.25 1.30 31.9 33.0 15.00 381.0 0.099 2.50 0.197 5.0 0.060 1.52 0.030 0.76 0.020 0.51 0.023 0.58

4588 23.94 608.0 25.51 648.0 1.40 1.43 35.5 36.4 18.00 457.2 0.108 2.75 0.216 5.5 0.072 1.83 0.036 0.91 0.023 0.58 0.024 0.61

4918 25.51 648.0 26.69 678.0 1.48 1.52 37.6 38.6 18.00 457.2 0.116 2.95 0.232 5.9 0.072 1.83 0.036 0.91 0.024 0.61 0.026 0.66

5258 26.69 678.0 --- --- 1.56 1.61 39.7 40.8 18.00 457.2 0.124 3.15 0.248 6.3 0.072 1.83 0.036 0.91 0.026 0.66 --- ---

* Parallel misalignment measured by rotating the hubs with a dial indicator on the outside hub diameter will result in a maximum TIR.

For sizes 494-644 use 0.010 inch per inch of “C” dimension (or 0.010 mm per mm of “C” dimension) for non-standard “C” dimensions. Multiply “C” x 0.010 to calculate the TIR.

For sizes 726-996 use 0.008 inch per inch of “C” dimension (or 0.008 mm per mm of “C” dimension) for non-standard “C” dimensions. Multiply “C” x 0.008 to calculate the TIR.

For sizes 1088-5258 use 0.004 inch per inch of “C” dimension (or 0.004 mm per mm of “C” dimension) for non-standard “C” dimensions. Multiply “C” x 0.004 to calculate the TIR.

** Parallel offset “P” is equivalent to one-half of the TIR measurement using dial indicators.

*** During installation and/or operation, do not exceed the maximum misalignment capacity of coupling.

For sizes 494-644 maximum misalignment capacity of coupling is 2/3º per disc pack.

For sizes 726-996 maximum misalignment capacity of coupling is 1/2º per disc pack.

For sizes 1088-5258 maximum misalignment capacity of coupling is 1/3º per disc pack.

Note: 1. Refer to Rexnord®Bulletin 538-214 Coupling Alignment Fundamentals for more details regarding alignment methods and procedures.

a. The Angular Misalignment value is the maximum difference between the measurements X and Y taken at opposite ends of the hub flanges, as shown in Figure 8.

b. The Parallel Misalignment value “P” is the offset between the centers of the hubs, as shown in Figure 9.

7. Final Assembly

Note: XTSR71 couplings are delivered from the factory with a

fully assembled center member subassembly with locknuts

tightened at the factory to the torque speciﬁed in Table 5. The

center member subassembly is ready for ﬁeld installation, and we

recommend that you do not disassemble it (unless you are

replacing the disc packs).

Verify that the hubs have been mounted as shown in Figure 4, to

provide the correct “C” length (deﬁned in Table 1). The “C”

length is the distance measured between the faces of the two

hub ﬂanges.

Due to the hub-to-adapter piloting feature, the center member

subassembly must be compressed to allow it to be slipped

between the two end hubs.

Use the hub to adapter cap screws (provided) as deﬁned in

Figure 2 and Table 4 to compress the center member assembly

by inserting them through the holes in the ﬂanges of the center

spool and threading them into the adapter tapped holes as shown

in Figure 10.

Spacer

Adapter

Compression

Cap Screw

Unitized Disc Pack

Figure 10

Note: Tighten the cap screws equally to compress both ends

only enough to allow the center member subassembly to ﬁt

between the hubs (do not tighten more than necessary to provide

clearance for assembly).

7.1 Make sure that the adapter and the hub ﬂange face and

pilots are free from foreign material, nicks and burrs to allow

for proper pilot seating.

7.2 Place the compressed center member between the

coupling hubs, lining up the tapped holes in the adapter

with the cap screw clearance holes in the hub. If the

coupling was assembly balanced, also align any match

marks.

7.3 Remove the cap screws from the spacer ﬂange to adapter,

allowing the hub outside diameter to make contact with the

pilot diameter of the adapter.

7.4 Lubricate the cap screw threads and insert the cap screws

through the hub ﬂange clearance holes and into the mating

threaded holes in the adapter. Tighten each cap screw to the

torque as listed in Table 4.

For further help with the installation or alignment consult Regal

Rexnord.

NOTICE All bolts and cap screw threads must be lubricated prior

to assembly. A clean motor oil is recommended. Do not use

lubricants containing molybdenum disulﬁde or greases.

WARNING! Remove any dust deposits from the coupling

components and the coupling elements in an appropriate way

for explosive environments.

Table 4 — Cap ScrewTightening Torque

8. Disc Pack Replacement

If it becomes necessary to replace the disc packs, it can be done

as follows.

Note: The XTSR71 center member subassemblies have

their locknuts factory tightened. On center member

subassemblies where the spacer length is short and wrench

access is limited, special wrenches are used to tighten the

locknuts. Consult Regal Rexnord for assistance in obtaining

these special wrenches.

8.1 Remove the center member subassembly by removing all

cap screws from hubs to compress the center member

assembly by inserting them through the holes in the ﬂanges

of the center spool and threading them into the adapter

tapped holes as shown in Figure 10 and dropping the center

member assembly out from between the hubs. There are

jacking screw tapped holes in each end hub to disengage

the pilots between the hubs and adapters, using the hub to

adapter cap screws as deﬁned in Table 4.

XTSR71

Coupling

Size

“A” Dimension

Std. Hub

Flange Hex Head Cap Screw-Standard Hub

“A” Dimension

XL Hub

Flange Hex Head Cap Screw-XL Hub

Cap

Screw

Size

Torque Wrench

Size

(mm)

Cap

Screw

Size

Torque Wrench

Size

(mm)

(in) (mm) (mm) (ft-lb) (Nm) (in) (mm) (mm) (ft-lb) (Nm)

494 2.77 70.0 M5x20 6.3 8.5 8 3.36 85.0 M5x20 6.3 8.5 8

644 3.36 85.0 M5x20 6.3 8.5 8 --- --- --- --- --- ---

726 3.74 95.0 M6x20 12.3 16.7 10 4.25 108.0 M6x20 12.3 16.7 10

826 4.25 108.0 M6x20 12.3 16.7 10 5.08 129.0 M8x25 27 36 13

996 5.08 129.0 M8x25 27.0 36 13 5.51 140.0 M6x25 12.3 16.7 10

1088 5.51 140.0 M6x25 12.3 16.7 10 6.54 166.0 M8x30 27 36 13

1298 6.54 166.0 M8x30 27 36 13 7.83 199.0 M10x35 51.0 69 15

1548 7.83 199.0 M10x35 51 69 15 8.66 220.0 M10x40 51.0 69 15

1698 8.66 220.0 M10x40 51 69 15 9.66 245.4 M12x40 92.0 124 16

1928 9.66 245.4 M12x40 92 124 16 10.39 264.0 M12x40 92.0 124 16

2068 10.39 264.0 M12x40 92 124 16 11.44 290.5 M12x50 92.0 124 16

2278 11.44 290.5 M12x50 92 124 16 12.32 313.0 M14x50 142 193 18

2468 12.32 313.0 M14x50 142 193 18 13.58 345.0 M12x60 92.0 124 16

2698 13.58 345.0 M12x60 92 124 16 15.00 381.0 M14x70 142 193 18

2888 15.00 381.0 M14x70 142 193 18 15.94 405.0 M14x70 142 193 18

3058 15.94 405.0 M14x70 142 193 18 17.20 437.0 M16x70 218 295 21

3358 17.20 437.0 M16x70 218 295 21 18.98 482.0 M16x80 218 295 21

3668 18.98 482.0 M16x80 218 295 21 19.80 503.0 M16x80 218 295 21

3908 19.80 503.0 M16x80 218 295 21 20.83 529.0 M16x80 218 295 21

4178 20.83 529.0 M16x80 218 295 21 23.94 608.0 M20x90 427 579 27

4588 23.94 608.0 M20x90 427 579 27 25.51 648.0 M20x100 427 579 27

4918 25.51 648.0 M20x100 427 579 27 26.69 678.0 M20x110 427 579 27

5258 26.69 678.0 M20x110 427 579 27 --- --- --- --- --- ---

Note:

1. These torque values are approximate for cap screws with lubricated threads.

8.2 Remove all locknuts, bolts, bushings, and disc packs.

Special wrenches may be required. Clean the two adapters

and the center spool, removing any nicks and burrs. See

Figure 2. Install the new disc packs to the adapters ﬁrst.

Note: Match marks (if applied at assembly balance) must be

in-line to maintain balance integrity.

8.3 Install the disc packs to the adapter ﬁrst so that the washer

heads of the disc pack line up with the bolt holes in the

adapter as shown in Figure 11A. Insert the bolts through

the adapter bolt holes and disc pack.

8.4 Install an overload bushing onto each bolt, as shown on

Figure 11A and 11B.

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